Discorsotheres, Ahyong, 2018

Ahyong, Shane T., 2018, Revision of Ostracotheres H. Milne Edwards, 1853 (Crustacea: Brachyura: Pinnotheridae), Raffles Bulletin of Zoology 66, pp. 538-571 : 554

Key to female Discorsotheres

1. Distomesial angle of maxilliped 3 evenly rounded ................. ........................... D. spondyli (tropical western Indian Ocean)

– Distomesial angle of maxilliped 3 obtusely angled...............2

2. Carapace longitudinal median swelling most pronounced in gastric and cardiac regions, giving distinctly sinuous, “hunched” lateral profile. Pereopod 3 propodus without row of long setae on distoflexor margin. Pereopod 4–5 dactyli 0.4 × propodus length ................. D. camposi (tropical western Pacific Ocean)

– Carapace longitudinal median swelling low, indistinct, lateral profile rounded. Pereopod 3 propodus with long, unevenly arranged row of setae on distoflexor margin. Pereopod 4–5 dactyli 0.5 × propodus length.................................................3

3. Orbit and antennular fossa aligned almost transversely in anterior view. Pereopod 2 dactylus weakly curved. Pereopod 3 merus length 1.4–1.5 (usually 1.5) × pereopod 4 merus length..... D. subglobosus (southern Australia)

– Orbit and antennular fossa aligned distinctly obliquely in anterior view. Pereopod 2 dactylus strongly curved. Pereopod 3 merus length 1.4 × pereopod 4 merus length........... D. subquadratus ( Japan and Nansha Islands, South China Sea)